Hi, my ex partner pays child maintenance for our daughter. The amount is set by the child maintenance service, but he pays me via standing order. For most of last year, he paid me around £80 more than the amount that was set by CMS. I told him about this several times and he said he would lower the amount, but he never did. I have no idea why he overpaid. This year however, since January, he is paying me less than the amount set by CMS. I haven't contacted CMS about it as I'm scared they will make me pay back the money that my ex overpaid me by. However, I need my ex to pay me the correct amount this year as I'm currently in dire financial straits. Does anyone know if my ex can claim back the overpayment, even though it was his mistake? Many thanks.